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Finding the Fourth Proportional to 272.76, 376.36 and 156.31

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Solution

The fourth proportional to 272.76, 376.36 and 156.31 is: 215.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.76 : 376.36 = 156.31 : x
  2. Step 2: Convert to fraction form
    272.76/376.36 = 156.31/x
  3. Step 3: Cross multiply
    272.76x = 376.36 × 156.31
  4. Step 4: Simplify right side
    272.76x = 58,828.83
  5. Step 5: Solve for x
    x = 58,828.83/272.76
  6. Step 6: Final answer
    x = 215.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.